GNU Emacs 31.1 ships, removing the unexec dumper and enabling xterm-mouse-mode by default

Sources: release tarballs, write-up, discussion
Summary: The 31.1 release tarballs are dated 2026-08-24 on ftp.gnu.org. The NEWS entries quoted in the write-up remove the unexec dumper deprecated since Emacs 27, stop building and installing the bundled ctags, and mark fourteen font-lock-*-face variables obsolete. The write-up also records xterm-mouse-mode on by default in compatible terminals, child frames on TTY frames, tree-sitter offering to install the grammar for a mode it knows about, and the new garbage collector postponed to Emacs 32.
Why it matters: Package maintainers have concrete migration work in the removed dumper, the dropped ctags build and the fourteen obsolete face variables.